It is me, again. I posted a question yesterday about an exam question that i have to answer. But i received a second question and i can choose which one i want to answer. It is also very long and difficult (for me) and again, any idea or start of answer will be appreciated and thanked . For your information it is a question of the exam of "electric traction" in 1st year of Master of electromechanical engineering at "Université Libre de Bruxelles".

Here is the question:

Consider the chopper based traction system on board of the M5 underground system used by the company MIVB in Brussels (circuit diagram 3R900673, pages 2 and 3).

Calculate and draw the essential waveforms of voltages and currents that occur in the power electronic circuit (4p).

Here is the link to dowload the figures useful to the questions (i don't know how put a folder in a message on a forum, sorry ):Here is the link to dowload the figures useful to the questions (i don't know how put a folder in a message on a forum, sorry ):